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Use of landslide for paleoseismic analysis : : 2011/06/09 Engineering Geology 43(1996) 291-323 Randall W. Jibson.

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Presentation on theme: "Use of landslide for paleoseismic analysis : : 2011/06/09 Engineering Geology 43(1996) 291-323 Randall W. Jibson."— Presentation transcript:

1 Use of landslide for paleoseismic analysis : : 2011/06/09 Engineering Geology 43(1996) Randall W. Jibson

2 Introduction

3 Paleoseismic landslide analysis involves three steps (1) Identifying a feature as a landslide. (2) Dating the landslide. (3) Showing that the landslide was triggered by earthquake. - Interpreting an earthquake origin for landslides. - Slope-stability analysis Interpreting results of paleoseismic landslide studies.

4 Identifying landslides Paleoseismic landslide analysis involves three steps (1) Identifying a feature as a landslide. (2) Dating the landslide. (3) Showing that the landslide was triggered by earthquake. - Interpreting an earthquake origin for landslides. - Slope-stability analysis Interpreting results of paleoseismic landslide studies.

5 Identifying surface features as landslides and classification Identifying landslides Varnes (1978)

6 Identifying landslides (1) Disrupted slides and falls (2) Coherent slides (3) Lateral spreads and flows

7 Dating the landslide Paleoseismic landslide analysis involves three steps (1) Identifying a feature as a landslide. (2) Dating the landslide. (3) Showing that the landslide was triggered by earthquake. - Interpreting an earthquake origin for landslides. - Slope-stability analysis Interpreting results of paleoseismic landslide studies.

8 Dating the landslide

9

10 Seismic landslide Paleoseismic landslide analysis involves three steps (1) Identifying a feature as a landslide. (2) Dating the landslide. (3) Showing that the landslide was triggered by earthquake. - Interpreting an earthquake origin for landslides. - Slope-stability analysis Interpreting results of paleoseismic landslide studies.

11 Seismic landslide

12

13 Slope-stability analysis Paleoseismic landslide analysis involves three steps (1) Identifying a feature as a landslide. (2) Dating the landslide. (3) Showing that the landslide was triggered by earthquake. - Interpreting an earthquake origin for landslides. - Slope-stability analysis Interpreting results of paleoseismic landslide studies.

14 Slope-stability analysis

15 Clay and silt Gravel and sand Loess

16 Slope-stability analysis slope-stability model

17 Slope-stability analysis

18 Most Likely Actual surface A B C D E AB CDE

19 Slope-stability analysis Seismic slope-stability analysis Ground water

20 Slope-stability analysis Most Likely Actual surface

21 Slope-stability analysis FS : static factor of safety FS

22 Slope-stability analysis Newmark displacement critical displacement : 5~10cm

23 Slope-stability analysis Jibson and Keefer (1993) Wilson and Keefer (1985)

24 Interpreting results Paleoseismic landslide analysis involves three steps (1) Identifying a feature as a landslide. (2) Dating the landslide. (3) Showing that the landslide was triggered by earthquake. - Interpreting an earthquake origin for landslides. - Slope-stability analysis Interpreting results of paleoseismic landslide studies.

25 Interpreting results CharacteristicsMinimum magnitudes

26 Interpreting results Keefer and Wilson (1989) Areas affectedMinimum intensities

27 Interpreting results Maximum distance from fault Maximum distance from epicenter

28 Conclusion

29 Thanks for your attention


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